US Made T6 Aluminum Body Airlite Series New “Honeycomb” Line Cerakote Blue Finish Proprietary Barrel Nut Included Total Weight Including Barrel Nut Is 8.9 oz 5 KeyMod Slots On 3 Sides of Front End Of Handguard Honeycomb Design Cuts Throughout Handguard to Reduce Weight and Reinforce Strength Rail System Slides Over Barrel Nut and is Locked Up Against Receiver With 6 Screws Tight Fit Up Against Receiver, Which Allows For A Monolithic Top Rail 15″ Length Heavy Duty Internal Diameter: 1.34″